8686f3ed06
Signed-off-by: Neil Brown <neilb@suse.de>
884 lines
23 KiB
C
884 lines
23 KiB
C
/*
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* mdadm - manage Linux "md" devices aka RAID arrays.
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*
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* Copyright (C) 2001-2004 Neil Brown <neilb@cse.unsw.edu.au>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Author: Neil Brown
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* Email: <neilb@cse.unsw.edu.au>
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* Paper: Neil Brown
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* School of Computer Science and Engineering
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* The University of New South Wales
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* Sydney, 2052
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* Australia
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*/
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#include "mdadm.h"
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/*
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* All handling for the 0.90.0 version superblock is in
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* this file.
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* This includes:
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* - finding, loading, and writing the superblock.
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* - initialising a new superblock
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* - printing the superblock for --examine
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* - printing part of the superblock for --detail
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* .. other stuff
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*/
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static unsigned long calc_sb0_csum(mdp_super_t *super)
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{
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unsigned long csum = super->sb_csum;
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unsigned long newcsum;
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super->sb_csum= 0 ;
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newcsum = calc_csum(super, MD_SB_BYTES);
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super->sb_csum = csum;
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return newcsum;
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}
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void super0_swap_endian(struct mdp_superblock_s *sb)
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{
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/* as super0 superblocks are host-endian, it is sometimes
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* useful to be able to swap the endianness
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* as (almost) everything is u32's we byte-swap every 4byte
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* number.
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* We then also have to swap the events_hi and events_lo
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*/
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char *sbc = (char *)sb;
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__u32 t32;
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int i;
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for (i=0; i < MD_SB_BYTES ; i+=4) {
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char t = sbc[i];
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sbc[i] = sbc[i+3];
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sbc[i+3] = t;
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t=sbc[i+1];
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sbc[i+1]=sbc[i+2];
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sbc[i+2]=t;
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}
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t32 = sb->events_hi;
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sb->events_hi = sb->events_lo;
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sb->events_lo = t32;
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t32 = sb->cp_events_hi;
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sb->cp_events_hi = sb->cp_events_lo;
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sb->cp_events_lo = t32;
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}
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#ifndef MDASSEMBLE
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static void examine_super0(void *sbv)
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{
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mdp_super_t *sb = sbv;
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time_t atime;
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int d;
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char *c;
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printf(" Magic : %08x\n", sb->md_magic);
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printf(" Version : %02d.%02d.%02d\n", sb->major_version, sb->minor_version,
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sb->patch_version);
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if (sb->minor_version >= 90)
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printf(" UUID : %08x:%08x:%08x:%08x\n", sb->set_uuid0, sb->set_uuid1,
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sb->set_uuid2, sb->set_uuid3);
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else
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printf(" UUID : %08x\n", sb->set_uuid0);
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atime = sb->ctime;
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printf(" Creation Time : %.24s\n", ctime(&atime));
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c=map_num(pers, sb->level);
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printf(" Raid Level : %s\n", c?c:"-unknown-");
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if ((int)sb->level >= 0) {
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int ddsks=0;
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printf(" Device Size : %d%s\n", sb->size, human_size((long long)sb->size<<10));
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switch(sb->level) {
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case 1: ddsks=1;break;
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case 4:
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case 5: ddsks = sb->raid_disks-1; break;
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case 6: ddsks = sb->raid_disks-2; break;
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case 10: ddsks = sb->raid_disks / (sb->layout&255) / ((sb->layout>>8)&255);
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}
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if (ddsks)
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printf(" Array Size : %llu%s\n", (unsigned long long)ddsks * sb->size,
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human_size(ddsks*(long long)sb->size<<10));
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}
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printf(" Raid Devices : %d\n", sb->raid_disks);
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printf(" Total Devices : %d\n", sb->nr_disks);
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printf("Preferred Minor : %d\n", sb->md_minor);
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printf("\n");
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if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
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printf(" Reshape pos'n : %llu%s\n", (unsigned long long)sb->reshape_position/2, human_size((long long)sb->reshape_position<<9));
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if (sb->delta_disks) {
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printf(" Delta Devices : %d", sb->delta_disks);
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if (sb->delta_disks)
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printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks, sb->raid_disks);
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else
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printf(" (%d->%d)\n", sb->raid_disks, sb->raid_disks+sb->delta_disks);
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}
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if (sb->new_level != sb->level) {
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c = map_num(pers, sb->new_level);
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printf(" New Level : %s\n", c?c:"-unknown-");
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}
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if (sb->new_layout != sb->layout) {
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if (sb->level == 5) {
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c = map_num(r5layout, sb->new_layout);
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printf(" New Layout : %s\n", c?c:"-unknown-");
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}
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if (sb->level == 10) {
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printf(" New Layout : near=%d, %s=%d\n",
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sb->new_layout&255,
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(sb->new_layout&0x10000)?"offset":"far",
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(sb->new_layout>>8)&255);
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}
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}
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if (sb->new_chunk != sb->chunk_size)
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printf(" New Chunksize : %d\n", sb->new_chunk);
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printf("\n");
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}
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atime = sb->utime;
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printf(" Update Time : %.24s\n", ctime(&atime));
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printf(" State : %s\n",
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(sb->state&(1<<MD_SB_CLEAN))?"clean":"active");
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if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
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printf("Internal Bitmap : present\n");
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printf(" Active Devices : %d\n", sb->active_disks);
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printf("Working Devices : %d\n", sb->working_disks);
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printf(" Failed Devices : %d\n", sb->failed_disks);
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printf(" Spare Devices : %d\n", sb->spare_disks);
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if (calc_sb0_csum(sb) == sb->sb_csum)
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printf(" Checksum : %x - correct\n", sb->sb_csum);
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else
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printf(" Checksum : %x - expected %lx\n", sb->sb_csum, calc_sb0_csum(sb));
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printf(" Events : %d.%d\n", sb->events_hi, sb->events_lo);
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printf("\n");
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if (sb->level == 5) {
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c = map_num(r5layout, sb->layout);
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printf(" Layout : %s\n", c?c:"-unknown-");
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}
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if (sb->level == 10) {
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printf(" Layout : near=%d, %s=%d\n",
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sb->layout&255,
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(sb->layout&0x10000)?"offset":"far",
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(sb->layout>>8)&255);
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}
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switch(sb->level) {
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case 0:
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case 4:
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case 5:
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printf(" Chunk Size : %dK\n", sb->chunk_size/1024);
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break;
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case -1:
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printf(" Rounding : %dK\n", sb->chunk_size/1024);
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break;
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default: break;
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}
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printf("\n");
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printf(" Number Major Minor RaidDevice State\n");
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for (d= -1; d<(signed int)(sb->raid_disks+sb->spare_disks); d++) {
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mdp_disk_t *dp;
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char *dv;
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char nb[5];
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int wonly;
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if (d>=0) dp = &sb->disks[d];
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else dp = &sb->this_disk;
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snprintf(nb, sizeof(nb), "%4d", d);
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printf("%4s %5d %5d %5d %5d ", d < 0 ? "this" : nb,
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dp->number, dp->major, dp->minor, dp->raid_disk);
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wonly = dp->state & (1<<MD_DISK_WRITEMOSTLY);
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dp->state &= ~(1<<MD_DISK_WRITEMOSTLY);
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if (dp->state & (1<<MD_DISK_FAULTY)) printf(" faulty");
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if (dp->state & (1<<MD_DISK_ACTIVE)) printf(" active");
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if (dp->state & (1<<MD_DISK_SYNC)) printf(" sync");
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if (dp->state & (1<<MD_DISK_REMOVED)) printf(" removed");
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if (wonly) printf(" write-mostly");
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if (dp->state == 0) printf(" spare");
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if ((dv=map_dev(dp->major, dp->minor, 0)))
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printf(" %s", dv);
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printf("\n");
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if (d == -1) printf("\n");
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}
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}
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static void brief_examine_super0(void *sbv)
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{
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mdp_super_t *sb = sbv;
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char *c=map_num(pers, sb->level);
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printf("ARRAY %s level=%s num-devices=%d UUID=",
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get_md_name(sb->md_minor),
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c?c:"-unknown-", sb->raid_disks);
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if (sb->minor_version >= 90)
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printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
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sb->set_uuid2, sb->set_uuid3);
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else
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printf("%08x", sb->set_uuid0);
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printf("\n");
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}
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static void detail_super0(void *sbv)
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{
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mdp_super_t *sb = sbv;
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printf(" UUID : ");
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if (sb->minor_version >= 90)
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printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
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sb->set_uuid2, sb->set_uuid3);
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else
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printf("%08x", sb->set_uuid0);
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printf("\n Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
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}
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static void brief_detail_super0(void *sbv)
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{
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mdp_super_t *sb = sbv;
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printf(" UUID=");
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if (sb->minor_version >= 90)
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printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
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sb->set_uuid2, sb->set_uuid3);
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else
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printf("%08x", sb->set_uuid0);
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}
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#endif
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static void uuid_from_super0(int uuid[4], void * sbv)
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{
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mdp_super_t *super = sbv;
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uuid[0] = super->set_uuid0;
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if (super->minor_version >= 90) {
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uuid[1] = super->set_uuid1;
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uuid[2] = super->set_uuid2;
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uuid[3] = super->set_uuid3;
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} else {
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uuid[1] = 0;
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uuid[2] = 0;
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uuid[3] = 0;
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}
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}
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static void getinfo_super0(struct mdinfo *info, void *sbv)
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{
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mdp_super_t *sb = sbv;
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int working = 0;
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int i;
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info->array.major_version = sb->major_version;
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info->array.minor_version = sb->minor_version;
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info->array.patch_version = sb->patch_version;
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info->array.raid_disks = sb->raid_disks;
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info->array.level = sb->level;
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info->array.layout = sb->layout;
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info->array.md_minor = sb->md_minor;
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info->array.ctime = sb->ctime;
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info->array.utime = sb->utime;
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info->array.chunk_size = sb->chunk_size;
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info->component_size = sb->size*2;
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info->disk.state = sb->this_disk.state;
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info->disk.major = sb->this_disk.major;
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info->disk.minor = sb->this_disk.minor;
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info->disk.raid_disk = sb->this_disk.raid_disk;
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info->disk.number = sb->this_disk.number;
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info->events = md_event(sb);
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info->data_offset = 0;
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uuid_from_super0(info->uuid, sbv);
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if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
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info->reshape_active = 1;
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info->reshape_progress = sb->reshape_position;
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info->new_level = sb->new_level;
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info->delta_disks = sb->delta_disks;
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info->new_layout = sb->new_layout;
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info->new_chunk = sb->new_chunk;
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} else
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info->reshape_active = 0;
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info->name[0] = 0;
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/* work_disks is calculated rather than read directly */
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for (i=0; i < MD_SB_DISKS; i++)
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if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
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(sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
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!(sb->disks[i].state & (1<<MD_DISK_FAULTY)))
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working ++;
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info->array.working_disks = working;
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}
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static int update_super0(struct mdinfo *info, void *sbv, char *update, char *devname, int verbose)
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{
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/* NOTE: for 'assemble' and 'force' we need to return non-zero if any change was made.
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* For others, the return value is ignored.
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*/
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int rv = 0;
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mdp_super_t *sb = sbv;
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if (strcmp(update, "sparc2.2")==0 ) {
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/* 2.2 sparc put the events in the wrong place
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* So we copy the tail of the superblock
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* up 4 bytes before continuing
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*/
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__u32 *sb32 = (__u32*)sb;
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memcpy(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
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sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
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(MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
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if (verbose >= 0)
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fprintf (stderr, Name ": adjusting superblock of %s for 2.2/sparc compatability.\n",
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devname);
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}
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if (strcmp(update, "super-minor") ==0) {
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sb->md_minor = info->array.md_minor;
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if (verbose > 0)
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fprintf(stderr, Name ": updating superblock of %s with minor number %d\n",
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devname, info->array.md_minor);
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}
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if (strcmp(update, "summaries") == 0) {
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int i;
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/* set nr_disks, active_disks, working_disks,
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* failed_disks, spare_disks based on disks[]
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* array in superblock.
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* Also make sure extra slots aren't 'failed'
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*/
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sb->nr_disks = sb->active_disks =
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sb->working_disks = sb->failed_disks =
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sb->spare_disks = 0;
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for (i=0; i < MD_SB_DISKS ; i++)
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if (sb->disks[i].major ||
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sb->disks[i].minor) {
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int state = sb->disks[i].state;
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if (state & (1<<MD_DISK_REMOVED))
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continue;
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sb->nr_disks++;
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if (state & (1<<MD_DISK_ACTIVE))
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sb->active_disks++;
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if (state & (1<<MD_DISK_FAULTY))
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sb->failed_disks++;
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else
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sb->working_disks++;
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if (state == 0)
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sb->spare_disks++;
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} else if (i >= sb->raid_disks && sb->disks[i].number == 0)
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sb->disks[i].state = 0;
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}
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if (strcmp(update, "force")==0) {
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__u32 ehi = sb->events_hi, elo = sb->events_lo;
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sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
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sb->events_lo = (info->events) & 0xFFFFFFFF;
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if (sb->events_hi != ehi ||
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sb->events_lo != elo)
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rv = 1;
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if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
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(sb->state & (1 << MD_SB_CLEAN)) == 0) {
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/* need to force clean */
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sb->state |= (1 << MD_SB_CLEAN);
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rv = 1;
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}
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}
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if (strcmp(update, "assemble")==0) {
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int d = info->disk.number;
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int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
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if ((sb->disks[d].state & ~(1<<MD_DISK_WRITEMOSTLY))
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!= info->disk.state) {
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sb->disks[d].state = info->disk.state | wonly;
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rv = 1;
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}
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}
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if (strcmp(update, "newdev") == 0) {
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int d = info->disk.number;
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memset(&sb->disks[d], 0, sizeof(sb->disks[d]));
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sb->disks[d].number = d;
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sb->disks[d].major = info->disk.major;
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sb->disks[d].minor = info->disk.minor;
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sb->disks[d].raid_disk = info->disk.raid_disk;
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sb->disks[d].state = info->disk.state;
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sb->this_disk = sb->disks[d];
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}
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if (strcmp(update, "grow") == 0) {
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sb->raid_disks = info->array.raid_disks;
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sb->nr_disks = info->array.nr_disks;
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sb->active_disks = info->array.active_disks;
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sb->working_disks = info->array.working_disks;
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memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
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sb->disks[info->disk.number].number = info->disk.number;
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sb->disks[info->disk.number].major = info->disk.major;
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sb->disks[info->disk.number].minor = info->disk.minor;
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sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
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sb->disks[info->disk.number].state = info->disk.state;
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if (sb->this_disk.number == info->disk.number)
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sb->this_disk = sb->disks[info->disk.number];
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}
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if (strcmp(update, "resync") == 0) {
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/* make sure resync happens */
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sb->state &= ~(1<<MD_SB_CLEAN);
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sb->recovery_cp = 0;
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}
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if (strcmp(update, "uuid") == 0) {
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sb->set_uuid0 = info->uuid[0];
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sb->set_uuid1 = info->uuid[1];
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sb->set_uuid2 = info->uuid[2];
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sb->set_uuid3 = info->uuid[3];
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}
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if (strcmp(update, "_reshape_progress")==0)
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sb->reshape_position = info->reshape_progress;
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sb->sb_csum = calc_sb0_csum(sb);
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return rv;
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}
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|
static __u64 event_super0(void *sbv)
|
|
{
|
|
mdp_super_t *sb = sbv;
|
|
return md_event(sb);
|
|
}
|
|
|
|
|
|
|
|
static int init_super0(struct supertype *st, void **sbp, mdu_array_info_t *info, unsigned long long size, char *ignored_name)
|
|
{
|
|
mdp_super_t *sb = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
|
|
int spares;
|
|
int rfd;
|
|
memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
|
|
|
|
if (info->major_version == -1) {
|
|
/* zeroing the superblock */
|
|
return 0;
|
|
}
|
|
|
|
spares = info->working_disks - info->active_disks;
|
|
if (info->raid_disks + spares > MD_SB_DISKS) {
|
|
fprintf(stderr, Name ": too many devices requested: %d+%d > %d\n",
|
|
info->raid_disks , spares, MD_SB_DISKS);
|
|
return 0;
|
|
}
|
|
|
|
rfd = open("/dev/urandom", O_RDONLY);
|
|
sb->md_magic = MD_SB_MAGIC;
|
|
sb->major_version = 0;
|
|
sb->minor_version = 90;
|
|
sb->patch_version = 0;
|
|
sb->gvalid_words = 0; /* ignored */
|
|
if (rfd < 0 || read(rfd, &sb->set_uuid0, 4) != 4)
|
|
sb->set_uuid0 = random();
|
|
sb->ctime = time(0);
|
|
sb->level = info->level;
|
|
if (size != info->size)
|
|
return 0;
|
|
sb->size = info->size;
|
|
sb->nr_disks = info->nr_disks;
|
|
sb->raid_disks = info->raid_disks;
|
|
sb->md_minor = info->md_minor;
|
|
sb->not_persistent = 0;
|
|
if (rfd < 0 || read(rfd, &sb->set_uuid1, 12) != 12) {
|
|
sb->set_uuid1 = random();
|
|
sb->set_uuid2 = random();
|
|
sb->set_uuid3 = random();
|
|
}
|
|
if (rfd >= 0)
|
|
close(rfd);
|
|
|
|
sb->utime = sb->ctime;
|
|
sb->state = info->state;
|
|
sb->active_disks = info->active_disks;
|
|
sb->working_disks = info->working_disks;
|
|
sb->failed_disks = info->failed_disks;
|
|
sb->spare_disks = info->spare_disks;
|
|
sb->events_hi = 0;
|
|
sb->events_lo = 1;
|
|
|
|
sb->layout = info->layout;
|
|
sb->chunk_size = info->chunk_size;
|
|
|
|
*sbp = sb;
|
|
return 1;
|
|
}
|
|
|
|
/* Add a device to the superblock being created */
|
|
static void add_to_super0(void *sbv, mdu_disk_info_t *dinfo)
|
|
{
|
|
mdp_super_t *sb = sbv;
|
|
mdp_disk_t *dk = &sb->disks[dinfo->number];
|
|
|
|
dk->number = dinfo->number;
|
|
dk->major = dinfo->major;
|
|
dk->minor = dinfo->minor;
|
|
dk->raid_disk = dinfo->raid_disk;
|
|
dk->state = dinfo->state;
|
|
}
|
|
|
|
static int store_super0(struct supertype *st, int fd, void *sbv)
|
|
{
|
|
unsigned long size;
|
|
unsigned long long dsize;
|
|
unsigned long long offset;
|
|
mdp_super_t *super = sbv;
|
|
|
|
#ifdef BLKGETSIZE64
|
|
if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
|
|
#endif
|
|
{
|
|
if (ioctl(fd, BLKGETSIZE, &size))
|
|
return 1;
|
|
else
|
|
dsize = ((unsigned long long)size)<<9;
|
|
}
|
|
|
|
if (dsize < MD_RESERVED_SECTORS*2*512)
|
|
return 2;
|
|
|
|
offset = MD_NEW_SIZE_SECTORS(dsize>>9);
|
|
|
|
offset *= 512;
|
|
|
|
if (lseek64(fd, offset, 0)< 0LL)
|
|
return 3;
|
|
|
|
if (write(fd, super, sizeof(*super)) != sizeof(*super))
|
|
return 4;
|
|
|
|
fsync(fd);
|
|
return 0;
|
|
}
|
|
|
|
static int write_init_super0(struct supertype *st, void *sbv, mdu_disk_info_t *dinfo, char *devname)
|
|
{
|
|
mdp_super_t *sb = sbv;
|
|
int fd = open(devname, O_RDWR|O_EXCL);
|
|
int rv;
|
|
|
|
if (fd < 0) {
|
|
fprintf(stderr, Name ": Failed to open %s to write superblock\n", devname);
|
|
return -1;
|
|
}
|
|
|
|
sb->disks[dinfo->number].state &= ~(1<<MD_DISK_FAULTY);
|
|
sb->disks[dinfo->number].state |= (1<<MD_DISK_SYNC);
|
|
|
|
sb->this_disk = sb->disks[dinfo->number];
|
|
sb->sb_csum = calc_sb0_csum(sb);
|
|
rv = store_super0(st, fd, sb);
|
|
|
|
if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
|
|
rv = st->ss->write_bitmap(st, fd, sbv);
|
|
|
|
close(fd);
|
|
if (rv)
|
|
fprintf(stderr, Name ": failed to write superblock to %s\n", devname);
|
|
return rv;
|
|
}
|
|
|
|
static int compare_super0(void **firstp, void *secondv)
|
|
{
|
|
/*
|
|
* return:
|
|
* 0 same, or first was empty, and second was copied
|
|
* 1 second had wrong number
|
|
* 2 wrong uuid
|
|
* 3 wrong other info
|
|
*/
|
|
mdp_super_t *first = *firstp;
|
|
mdp_super_t *second = secondv;
|
|
|
|
int uuid1[4], uuid2[4];
|
|
if (second->md_magic != MD_SB_MAGIC)
|
|
return 1;
|
|
if (!first) {
|
|
first = malloc(MD_SB_BYTES);
|
|
memcpy(first, second, MD_SB_BYTES);
|
|
*firstp = first;
|
|
return 0;
|
|
}
|
|
|
|
uuid_from_super0(uuid1, first);
|
|
uuid_from_super0(uuid2, second);
|
|
if (!same_uuid(uuid1, uuid2, 0))
|
|
return 2;
|
|
if (first->major_version != second->major_version ||
|
|
first->minor_version != second->minor_version ||
|
|
first->patch_version != second->patch_version ||
|
|
first->gvalid_words != second->gvalid_words ||
|
|
first->ctime != second->ctime ||
|
|
first->level != second->level ||
|
|
first->size != second->size ||
|
|
first->raid_disks != second->raid_disks )
|
|
return 3;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int load_super0(struct supertype *st, int fd, void **sbp, char *devname)
|
|
{
|
|
/* try to read in the superblock
|
|
* Return:
|
|
* 0 on success
|
|
* 1 on cannot get superblock
|
|
* 2 on superblock meaningless
|
|
*/
|
|
unsigned long size;
|
|
unsigned long long dsize;
|
|
unsigned long long offset;
|
|
mdp_super_t *super;
|
|
|
|
#ifdef BLKGETSIZE64
|
|
if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
|
|
#endif
|
|
{
|
|
if (ioctl(fd, BLKGETSIZE, &size)) {
|
|
if (devname)
|
|
fprintf(stderr, Name ": cannot find device size for %s: %s\n",
|
|
devname, strerror(errno));
|
|
return 1;
|
|
} else
|
|
dsize = size << 9;
|
|
}
|
|
|
|
if (dsize < MD_RESERVED_SECTORS*2) {
|
|
if (devname)
|
|
fprintf(stderr, Name ": %s is too small for md: size is %ld sectors.\n",
|
|
devname, size);
|
|
return 1;
|
|
}
|
|
|
|
offset = MD_NEW_SIZE_SECTORS(dsize>>9);
|
|
|
|
offset *= 512;
|
|
|
|
ioctl(fd, BLKFLSBUF, 0); /* make sure we read current data */
|
|
|
|
if (lseek64(fd, offset, 0)< 0LL) {
|
|
if (devname)
|
|
fprintf(stderr, Name ": Cannot seek to superblock on %s: %s\n",
|
|
devname, strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
super = malloc(MD_SB_BYTES + sizeof(bitmap_super_t));
|
|
|
|
if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
|
|
if (devname)
|
|
fprintf(stderr, Name ": Cannot read superblock on %s\n",
|
|
devname);
|
|
free(super);
|
|
return 1;
|
|
}
|
|
|
|
if (st->ss && st->minor_version == 9)
|
|
super0_swap_endian(super);
|
|
|
|
if (super->md_magic != MD_SB_MAGIC) {
|
|
if (devname)
|
|
fprintf(stderr, Name ": No super block found on %s (Expected magic %08x, got %08x)\n",
|
|
devname, MD_SB_MAGIC, super->md_magic);
|
|
free(super);
|
|
return 2;
|
|
}
|
|
|
|
if (super->major_version != 0) {
|
|
if (devname)
|
|
fprintf(stderr, Name ": Cannot interpret superblock on %s - version is %d\n",
|
|
devname, super->major_version);
|
|
free(super);
|
|
return 2;
|
|
}
|
|
*sbp = super;
|
|
if (st->ss == NULL) {
|
|
st->ss = &super0;
|
|
st->minor_version = 90;
|
|
st->max_devs = MD_SB_DISKS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct supertype *match_metadata_desc0(char *arg)
|
|
{
|
|
struct supertype *st = malloc(sizeof(*st));
|
|
if (!st) return st;
|
|
|
|
st->ss = &super0;
|
|
st->minor_version = 90;
|
|
st->max_devs = MD_SB_DISKS;
|
|
if (strcmp(arg, "0") == 0 ||
|
|
strcmp(arg, "0.90") == 0 ||
|
|
strcmp(arg, "default") == 0
|
|
)
|
|
return st;
|
|
|
|
st->minor_version = 9; /* flag for 'byte-swapped' */
|
|
if (strcmp(arg, "0.swap")==0)
|
|
return st;
|
|
|
|
free(st);
|
|
return NULL;
|
|
}
|
|
|
|
static __u64 avail_size0(struct supertype *st, __u64 devsize)
|
|
{
|
|
if (devsize < MD_RESERVED_SECTORS*2)
|
|
return 0ULL;
|
|
return MD_NEW_SIZE_SECTORS(devsize);
|
|
}
|
|
|
|
static int add_internal_bitmap0(struct supertype *st, void *sbv, int chunk, int delay, int write_behind, unsigned long long size, int may_change, int major)
|
|
{
|
|
/*
|
|
* The bitmap comes immediately after the superblock and must be 60K in size
|
|
* at most. The default size is between 30K and 60K
|
|
*
|
|
* size is in sectors, chunk is in bytes !!!
|
|
*/
|
|
unsigned long long bits;
|
|
unsigned long long max_bits = 60*1024*8;
|
|
unsigned long long min_chunk;
|
|
mdp_super_t *sb = sbv;
|
|
bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
|
|
|
|
|
|
min_chunk = 4096; /* sub-page chunks don't work yet.. */
|
|
bits = (size * 512) / min_chunk + 1;
|
|
while (bits > max_bits) {
|
|
min_chunk *= 2;
|
|
bits = (bits+1)/2;
|
|
}
|
|
if (chunk == UnSet)
|
|
chunk = min_chunk;
|
|
else if (chunk < min_chunk)
|
|
return 0; /* chunk size too small */
|
|
|
|
sb->state |= (1<<MD_SB_BITMAP_PRESENT);
|
|
|
|
memset(bms, 0, sizeof(*bms));
|
|
bms->magic = __cpu_to_le32(BITMAP_MAGIC);
|
|
bms->version = __cpu_to_le32(major);
|
|
uuid_from_super0((int*)bms->uuid, sb);
|
|
bms->chunksize = __cpu_to_le32(chunk);
|
|
bms->daemon_sleep = __cpu_to_le32(delay);
|
|
bms->sync_size = __cpu_to_le64(size);
|
|
bms->write_behind = __cpu_to_le32(write_behind);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
void locate_bitmap0(struct supertype *st, int fd, void *sbv)
|
|
{
|
|
unsigned long long dsize;
|
|
unsigned long size;
|
|
unsigned long long offset;
|
|
#ifdef BLKGETSIZE64
|
|
if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
|
|
#endif
|
|
{
|
|
if (ioctl(fd, BLKGETSIZE, &size))
|
|
return;
|
|
else
|
|
dsize = ((unsigned long long)size)<<9;
|
|
}
|
|
|
|
if (dsize < MD_RESERVED_SECTORS*2)
|
|
return;
|
|
|
|
offset = MD_NEW_SIZE_SECTORS(dsize>>9);
|
|
|
|
offset *= 512;
|
|
|
|
offset += MD_SB_BYTES;
|
|
|
|
lseek64(fd, offset, 0);
|
|
}
|
|
|
|
int write_bitmap0(struct supertype *st, int fd, void *sbv)
|
|
{
|
|
unsigned long size;
|
|
unsigned long long dsize;
|
|
unsigned long long offset;
|
|
mdp_super_t *sb = sbv;
|
|
|
|
int rv = 0;
|
|
|
|
int towrite, n;
|
|
char buf[4096];
|
|
|
|
#ifdef BLKGETSIZE64
|
|
if (ioctl(fd, BLKGETSIZE64, &dsize) != 0)
|
|
#endif
|
|
{
|
|
if (ioctl(fd, BLKGETSIZE, &size))
|
|
return 1;
|
|
else
|
|
dsize = ((unsigned long long)size)<<9;
|
|
}
|
|
|
|
if (dsize < MD_RESERVED_SECTORS*2)
|
|
return -1;
|
|
|
|
offset = MD_NEW_SIZE_SECTORS(dsize>>9);
|
|
|
|
offset *= 512;
|
|
|
|
if (lseek64(fd, offset + 4096, 0)< 0LL)
|
|
return 3;
|
|
|
|
|
|
if (write(fd, ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t)) !=
|
|
sizeof(bitmap_super_t))
|
|
return -2;
|
|
towrite = 64*1024 - MD_SB_BYTES - sizeof(bitmap_super_t);
|
|
memset(buf, 0xff, sizeof(buf));
|
|
while (towrite > 0) {
|
|
n = towrite;
|
|
if (n > sizeof(buf))
|
|
n = sizeof(buf);
|
|
n = write(fd, buf, n);
|
|
if (n > 0)
|
|
towrite -= n;
|
|
else
|
|
break;
|
|
}
|
|
fsync(fd);
|
|
if (towrite)
|
|
rv = -2;
|
|
|
|
return rv;
|
|
}
|
|
|
|
struct superswitch super0 = {
|
|
#ifndef MDASSEMBLE
|
|
.examine_super = examine_super0,
|
|
.brief_examine_super = brief_examine_super0,
|
|
.detail_super = detail_super0,
|
|
.brief_detail_super = brief_detail_super0,
|
|
#endif
|
|
.uuid_from_super = uuid_from_super0,
|
|
.getinfo_super = getinfo_super0,
|
|
.update_super = update_super0,
|
|
.event_super = event_super0,
|
|
.init_super = init_super0,
|
|
.add_to_super = add_to_super0,
|
|
.store_super = store_super0,
|
|
.write_init_super = write_init_super0,
|
|
.compare_super = compare_super0,
|
|
.load_super = load_super0,
|
|
.match_metadata_desc = match_metadata_desc0,
|
|
.avail_size = avail_size0,
|
|
.add_internal_bitmap = add_internal_bitmap0,
|
|
.locate_bitmap = locate_bitmap0,
|
|
.write_bitmap = write_bitmap0,
|
|
.major = 0,
|
|
.swapuuid = 0,
|
|
};
|